Abstract: This paper presents test results of static incremental loading and cyclic loading test results of fully bonded buoyancy anchors in soft rock mass. Various parameters, such as, stressdeformation, bonding length, allowable anchor deflection and bonding strength between anchor and soft rock, are evaluated. The following conclusions could be reached: the deformation characteristics of the fully bonded anchors in soft rock start with the elastic, elastoplastic and finally, full plastic stage would be reached; An allowable deflection of 10 mm at the head of the anchor can be used; the maximum bond length of 4 meters can be used and the average bond strength, frbk,  of 127 kPa can be used in the design.

Key words: Buoyancy Rock Anchors, Pullout Tests, Anchor Length, Allowable Deflection, Bond Strength